Investment Securities - Schedule of Amortized Cost and Fair Value of Securities Available-for-Sale and Securities Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025
Agency mortgage-backed: residential [Member]
Available-for-sale Securities
Available-for-sale Securities, Amortized cost	$ 11,832	$ 9,950
Available-for-sale Securities, Gross unrealized gains	12
Available-for-sale Securities, Gross unrealized losses	117	193
Available-for-sale Securities, Estimated fair value	11,727	9,757
Held-to-maturity Securities
Held-to-maturity Securities, Amortized cost	161	171
Held-to-maturity Securities, Gross unrealized gains	2
Held-to-maturity Securities, Gross unrealized losses	4	4
Held-to-maturity Securities, Estimated fair value	159	167
Agency mortgage-backed securities [Member] \| Less Than 12 Months [Member]
Available-for-sale Securities
Available-for-sale Securities, Amortized cost	1,031	2,000
Available-for-sale Securities, Gross unrealized losses	2	20
Available-for-sale Securities, Estimated fair value	1,029	1,980
Held-to-maturity Securities
Held-to-maturity Securities, Amortized cost
Held-to-maturity Securities, Gross unrealized losses
Held-to-maturity Securities, Estimated fair value
Agency mortgage-backed securities [Member] \| 12 Months or More [Member]
Available-for-sale Securities
Available-for-sale Securities, Amortized cost	7,396	6,700
Available-for-sale Securities, Gross unrealized losses	115	173
Available-for-sale Securities, Estimated fair value	7,281	6,527
Held-to-maturity Securities
Held-to-maturity Securities, Amortized cost	98	108
Held-to-maturity Securities, Gross unrealized losses	4	5
Held-to-maturity Securities, Estimated fair value	94	103
Total Temporarily Impaired AFS Securities [Member]
Available-for-sale Securities
Available-for-sale Securities, Amortized cost	8,427	8,700
Available-for-sale Securities, Gross unrealized losses	117	193
Available-for-sale Securities, Estimated fair value	8,310	8,507
Total Temporarily Impaired HTM Securities [Member]
Held-to-maturity Securities
Held-to-maturity Securities, Amortized cost	98	108
Held-to-maturity Securities, Gross unrealized losses	4	5
Held-to-maturity Securities, Estimated fair value	$ 94	$ 103

Kentucky First Federal Bancorp 10-Q